personally, i would skip the class notes, to be honest. I go straight to uplearn because it's more interactive than just reading my notes. i put a lot more focus on exam questions, cause there are only so many questions exam boards can use, and seeing questions before definitely helps in topic tests. sometimes i go through tests with the mark scheme open, just to see what it is that I'm missing. it's been helping me a lot in chem to keep up with the past papers. especially multiple choice.
i've seen improvement in uplearn--back when i wasn't using it as much, i was kind of staying at the same level with a lot less effort. like i'd do 30 minutes of uplearn and walk out of a test with a c when i used to do 2 hours of revision and get that kind of result. since starting this new year and putting a lot more emphasis on using uplearn (i try to average at least 15 hours a week) i've actually been going up in grades. it's not perfect, and i think the way you do exam practice in it can be quite rigid, but the exam how to's are great! if you can find them, do them.
it can be really repetitive, and if you get one thing wrong on the subsection tests, even if you get the same question right elsewhere, you still have to relearn that section. sometimes it also takes a while to get to the point, so that can be annoying, but it's very good for using your time efficiently.